 public class Example3_6 {

   public static void main(String args[]) {

      double sum=0,item=1;

      int i=1,n=20;

      while(i<=n) { 

          sum=sum+item;

          i=i+1; 

          item=item*(1.0/i);         

      }

      System.out.println("sum="+sum);

   }

}
